The Swedish Defence Agency (FOI) and the Technical Research Institute of Sweden (SP) have jointly carried out a project as contracted by the Swedish Materiel Administration (FMV). The project aimed to carry out a limited feasibility study of the concept to deploy water mist inside a ship to decrease the effect of detonating munitions. The feasibility study covered: ? the effects of water mist on electronics and electrical equipment inside the ship; ? the available warning before impact; ? the possibilities to predict where on the ship the incoming threat will impact; ? the required reaction time to fill a volume in the ship with water mist and the volumes required to maintain the mist during the engagement sequence. The study clearly indicates that a system based on water mist effectively could be deployed on-board ships to decrease the effects generated by an internal blast. The reductions in generated over-pressure, quasi-static pressure and impulse are in the order of 30-50%. Furthermore, the study shows that the fire-suppression in the FIST-project is suitable also as an explosion mitigation system, albeit with an increased flow. This means that the same nozzle configuration, piping etcetera can be used for both firefighting and explosion mitigation. Overall, the study clearly indicates that a water mist system for explosion mitigation could be deployed to ships and that it would reduce the effects generated by internal blasts with 30-50%.